US4493668A - Method for combined baking-out and panel-sealing of a partially-assembled CRT - Google Patents

Method for combined baking-out and panel-sealing of a partially-assembled CRT Download PDF

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Publication number
US4493668A
US4493668A US06/458,653 US45865383A US4493668A US 4493668 A US4493668 A US 4493668A US 45865383 A US45865383 A US 45865383A US 4493668 A US4493668 A US 4493668A
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US
United States
Prior art keywords
funnel
jets
method defined
panel
sealing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US06/458,653
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English (en)
Inventor
Joseph J. Piascinski
Randolph H. Axelrod
James Mount
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RCA Licensing Corp
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RCA Corp
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Assigned to RCA CORPORATION, A CORP. OF reassignment RCA CORPORATION, A CORP. OF ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AXELROD, RANDOLPH H., MOUNT, JAMES, PIASCINSKI, JOSEPH J.
Priority to US06/458,653 priority Critical patent/US4493668A/en
Priority to CA000444350A priority patent/CA1229131A/en
Priority to JP59004232A priority patent/JPS59138035A/ja
Priority to GB08400910A priority patent/GB2135504B/en
Priority to IT19160/84A priority patent/IT1174467B/it
Priority to FR8400493A priority patent/FR2539553B1/fr
Priority to KR1019840000189A priority patent/KR920004638B1/ko
Publication of US4493668A publication Critical patent/US4493668A/en
Application granted granted Critical
Assigned to RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE reassignment RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RCA CORPORATION, A CORP. OF DE
Priority to HK413/91A priority patent/HK41391A/xx
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/26—Sealing together parts of vessels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/26—Sealing together parts of vessels
    • H01J9/263—Sealing together parts of vessels specially adapted for cathode-ray tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/38—Exhausting, degassing, filling, or cleaning vessels

Definitions

  • This invention relates to a novel method for making a CRT (cathode-ray tube) and particularly to a novel method wherein a partially-completed faceplate-panel assembly is baked out and the panel simultaneously heat-sealed to a funnel assembly.
  • a color-television picture tube which is a type of CRT, is usually prepared by steps including (a) producing a luminescent-viewing-screen structure on the inner surface of a faceplate panel, (b) baking the panel assembly in air at elevated temperatures to remove moisture and substantially all of the organic matter from the screen structure, (c) heat-sealing the panel to the large opening of a funnel by baking the panel-funnel assembly in air at elevated temperatures, (d) sealing an electron-gun mount assembly into the neck that is attached to the funnel and then (e) exhausting and sealing the assembly.
  • baking steps (b) and (c) Prior proposals for combining these baking steps have been only partially successful for one or more of the following reasons. Some prior methods are too slow for use in normal factory operation. Some prior methods do not completely remove substantially all of the organic matter in the screen structure or degrade the performance of the viewing screen. Some prior methods produce a discolored seal between the panel and the funnel, which seal may be prone to electrical breakdown in the presence of the electrical fields that are normally present when operating the CRT.
  • the novel method in a single baking step, removes substantially all of the organic matter from the screen structure, produces an acceptable panel-funnel seal using the normal thermal sealing cycle, does not degrade the performance of the viewing screen and is otherwise compatible with the other steps for making the CRT.
  • the novel method comprises heat-sealing a glass faceplate panel to a glass funnel having an open, relatively-narrow neck attached thereto and, at the same time, baking-out substantial amounts of organic matter from coatings on the inside surfaces of the panel and funnel.
  • the heat-sealing and baking-out step is conducted at elevated temperatures in a substantially-quiescent atmosphere.
  • the novel method unlike any prior method, comprises intermittently directing jets or puffs of oxygen-containing gas into the neck of said funnel during the heating-up period of the heat-sealing step.
  • the novel method is conducted preferably with dry air at temperatures in the range of 150° to 450° C.
  • intermittently is meant that the jets of gas are flowing for a portion and then are not flowing for a portion of a plurality of successive time intervals.
  • the jets may flow in any direction, but are preferably at a relatively-small angle with respect to the longitudinal axis of the neck of the CRT.
  • FIG. 1 is a partially-schematic sectional elevational view of a periodic oven for practicing a first embodiment of the novel method.
  • FIG. 2 is a partially-schematic sectional elevational view of a continuous-belt oven for practicing a second embodiment of the novel method.
  • FIG. 3 is an enlarged fragmentary view along section lines 3--3 of FIG. 2.
  • FIG. 4 is an enlarged fragmentary view along section lines 4--4 of FIG. 2.
  • FIG. 5 is a graph representing the temperature profile experienced by the leading edge of a tube passing through the oven shown in FIG. 2.
  • a glass faceplate panel is heat-sealed to a glass funnel with a devitrifiable glass frit, by the method described, for example, in U.S. Pat. No. Re. 25,791 to S. A. Claypoole to form the bulb or panel-funnel assembly.
  • a mask assembly is mounted in the faceplate panel, and a viewing screen structure is produced on the inner surface of the panel.
  • the funnel is provided with an internal electrically-conductive coating, which may be comprised of graphite and a binder.
  • the funnel is comprised of a cone adapted to be sealed to the faceplate panel at its larger end and an integral cylindrical neck at its smaller end that is adapted to receive the stem of a mount assembly.
  • the viewing-screen structure and panel are baked in air at elevated temperatures to remove moisture and organic matter as a separate step prior to the step of heat-sealing the panel to the funnel.
  • the novel method differs from usual prior methods in that the latter step of heat-sealing is modified so that the purposes of the two steps are carried out with one baking with the resultant savings in labor, equipment, fuel and floor space.
  • the novel method may be practiced in a periodic oven, such as the oven 21, shown in FIG. 1, in which the parts to be sealed are supported in a sealing fixture 23, which remains stationary throughout the heat treatment.
  • the sealing fixture 23 comprises a tubular frame which is supported on a refractory ceramic batt 25 having a batt hole 27 therethrough.
  • the batt 25 is supported on a plurality of refractory ceramic blocks 29, which rest on the floor 30 of the oven.
  • a glass funnel 31 rests in the support arms 33 of the fixture 23 with the neck 35 of the funnel 31 down and the open end thereof up.
  • the neck 35 has a longitudinal neck axis 37, which is at an acute angle to vertical.
  • the open end of the neck 35 is above and spaced from the batt hole 27 in the batt 25.
  • the upper edge of the funnel 31 comprises a seal land, which carries a layer 30 of glass-frit-sealing material.
  • a glass faceplate panel 39 has a matching seal land, which rests on the layer 39 of sealing material.
  • a tube 40 passes through a small floor hole 41 in the floor 30 of the oven opposite and spaced from the batt hole 27 in the batt 25.
  • the tube 40 has a tube axis 42, which passes through the batt hole 27 and intersects the neck axis 37 at about the open end of the neck 35, at an acute angle 43.
  • the tube 40 is supplied intermittently with air from a source 45 through a manual valve 47 and a time-controlled valve 49.
  • the oven 21 is heated in a controlled manner with electric resistance heating elements (not shown).
  • the various parts are assembled as shown in FIG. 1 with the manual valve 47 open.
  • the atmosphere of the oven 21 is air which is quiescent.
  • the oven 21 is heated up to about 440° C. in about 85 minutes, where that temperature is held for about 55 minutes, after which the oven 21 is cooled down to room temperature in about 150 minutes.
  • no air flows through the tube 40 During the initial 25 minutes of the heating-up period, no air flows through the tube 40.
  • the time-controlled valve 49 alternately opens for about 20 seconds and closes for about 40 seconds permitting jets of air to issue intermittently from the tube 40 toward the open end of the neck 35.
  • the time-controlled valve 49 is closed and remains closed for the remainder of the heating cycle.
  • the effect of the intermittent jets of air in a quiescent atmosphere during the heating-up period is to drive out gases that are inside the funnel 31 and to replace them with air.
  • Other techniques have been tried and have been found to be less effective.
  • a continuous jet of air instead of intermittent jets is not as effective because, it is believed, a continuous jet stream appears to trap gases in the funnel instead of driving them out.
  • a turbulent atmosphere in the oven with no jets is not as effective because, it is believed, there is a very poor exchange of gases between the oven atmosphere and inside the funnel through the neck.
  • the neck axis 37 may be at any angle 43 with respect to the tube axis 42.
  • the novel method may also be practiced in a continuous tunnel oven, such as the oven 51 shown in FIGS. 2, 3 and 4, which comprises a three-zone heated chamber having a relatively quiescent atmosphere except as will be described below with respect to the novel features of the novel method.
  • a steel mesh belt 53 is supported on an idler pulley 55 at the input end and a drive pulley 57 at the output end, which pulleys are located outside the chamber.
  • the belt 53 passes over the input-end idler pulley 55, through the chamber through openings at each end thereof, over intermediate idler pulleys 56 in the chamber, and then over the drive pulley 57.
  • the belt 53 returns under and outside the chamber to the input-end idler pulley 55.
  • the belt 53 moves through the tunnel oven 51 at a rate such that each point on the belt is in the chamber for about 300 minutes (5 hours), with about 90 minutes in the heating-up zone, about 60 minutes in the central-soaking zone, and about 150 minutes in the cooling-down zone.
  • the rate of movement of the belt and the time spent in the chamber may be varied considerably from those given in this example, as is known by persons of ordinary skill in this art.
  • fixtures 59 similar to the fixture 23 shown in FIG. 1, are placed on the belt 53, five fixtures 59 being in a line across the belt 53.
  • Each fixture 53 is then loaded neck down with each funnel 61 having a layer 63 of frit-sealing material on the seal land thereof at its wider end.
  • a faceplate panel 65 having an unbaked-screen structure on its inner surface is placed on the funnel 61 with its matching seal land on the sealing-material layer 63.
  • Successive lines across the moving belt provide five columns of fixtures 59 moving through the chamber of the oven 51.
  • the funnel 61 is tipped so that the open end of the neck 67 thereof is tipped from vertical toward the drive pulley 57 by an acute angle 69 of about 15° and also towards the center of the belt 53 by an acute angle 71 of about 10°.
  • a manifold 73 with a plurality of spaced-out nozzles 75 directed vertically upward through the belt 53.
  • Each manifold 73 connects to a header 77, which connects to a source of compressed air (not shown) through a manual valve 79, a constant pressure outlet valve 81, a dryer 83, a flow meter 85 and a control valve 87.
  • the array of nozzles 75 extends over only a portion of the heating-up zone of the oven.
  • the belt 53 with the fixtures 59 moves at a substantially constant rate in the direction of the drive pulley 57.
  • dry air passing through the header 77 is distributed to the five manifolds 73 and then issues as constant streams from the nozzles 75 directed vertically upwardly through the belt 53.
  • the open ends of the necks 67 of the funnels therein pass over successive jet streams issuing from the columns of nozzles below.
  • the open ends of the necks 67 are alternately in and out of the jet streams issuing from successive nozzles, which are spaced apart sufficiently.
  • the effect on each funnel 61 is to experience jets of oxygen-containing gas intermittently directed into the neck thereof.
  • FIG. 5 is a curve 89 showing the temperature in °C. of the leading edges of the seal lands of a typical 25V 100° panel-funnel assembly as it passes through the oven 51 versus elapsed time in the oven 51 in minutes.
  • the cross-hatched area in FIG. 5 indicates the portion of the heating cycle during which the jets of air are applied. No jets are applied elsewhere in the cycle. Except for convection currents, which are generally quite weak, the atmosphere in the oven is essentially still.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US06/458,653 1983-01-17 1983-01-17 Method for combined baking-out and panel-sealing of a partially-assembled CRT Expired - Lifetime US4493668A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US06/458,653 US4493668A (en) 1983-01-17 1983-01-17 Method for combined baking-out and panel-sealing of a partially-assembled CRT
CA000444350A CA1229131A (en) 1983-01-17 1983-12-28 Method for combined baking-out and panel-sealing of a partially-assembled crt
JP59004232A JPS59138035A (ja) 1983-01-17 1984-01-12 陰極線管の製造方法
IT19160/84A IT1174467B (it) 1983-01-17 1984-01-13 Metodo per operazioni compinate di cottura e di sigillatura del pannello di un tubo a raggi catodici parzialmente assemblato
GB08400910A GB2135504B (en) 1983-01-17 1984-01-13 Method of making a cathode ray tube
FR8400493A FR2539553B1 (fr) 1983-01-17 1984-01-13 Procede de fabrication d'un tube a rayons cathodiques, notamment d'un tube-image couleur
KR1019840000189A KR920004638B1 (ko) 1983-01-17 1984-01-17 부분 조립된 음극선관의 면판 밀봉 및 굽는 방법
HK413/91A HK41391A (en) 1983-01-17 1991-05-30 Method of making a cathode ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/458,653 US4493668A (en) 1983-01-17 1983-01-17 Method for combined baking-out and panel-sealing of a partially-assembled CRT

Publications (1)

Publication Number Publication Date
US4493668A true US4493668A (en) 1985-01-15

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US06/458,653 Expired - Lifetime US4493668A (en) 1983-01-17 1983-01-17 Method for combined baking-out and panel-sealing of a partially-assembled CRT

Country Status (8)

Country Link
US (1) US4493668A (enrdf_load_stackoverflow)
JP (1) JPS59138035A (enrdf_load_stackoverflow)
KR (1) KR920004638B1 (enrdf_load_stackoverflow)
CA (1) CA1229131A (enrdf_load_stackoverflow)
FR (1) FR2539553B1 (enrdf_load_stackoverflow)
GB (1) GB2135504B (enrdf_load_stackoverflow)
HK (1) HK41391A (enrdf_load_stackoverflow)
IT (1) IT1174467B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5145511A (en) * 1991-11-08 1992-09-08 Videocolor Spa Method for manufacturing a metallized luminescent screen for a cathode-ray tube
US5405722A (en) * 1993-12-22 1995-04-11 Rca Thomson Licensing Corp. Method for combined baking-out and sealing of an electrophotographically processed screen assembly for a cathode-ray tube
EP1126498A3 (de) * 2000-01-28 2006-08-23 ELINO INDUSTRIE-OFENBAU CARL HANF GmbH & CO. Verfahren und Vorrichtung zur Wärmebehandlung von Bildröhren

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3439198C2 (de) * 1984-10-26 1993-10-14 Nokia Deutschland Gmbh Gestell zur Aufnahme einer Kathodenstrahlröhre
US4923423A (en) * 1989-06-30 1990-05-08 Rca Licensing Corporation Integrated thermal processing for kinescopes
JP3089480B2 (ja) * 1990-09-20 2000-09-18 ソニー株式会社 フリットシール装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041127A (en) * 1959-12-22 1962-06-26 Rca Corp Method of fabricating a cathode ray tube
US3658401A (en) * 1970-01-06 1972-04-25 Rca Corp Method of manufacture of cathode ray tubes having frit-sealed envelope assemblies
US3932011A (en) * 1974-06-05 1976-01-13 Rca Corporation Conditioning partially-completed CRT bulb assembly for storage and/or transit
US4058387A (en) * 1975-07-03 1977-11-15 Owens-Illinois, Inc. Simultaneously baking and sealing a faceplate assembly
US4154494A (en) * 1977-05-23 1979-05-15 Corning Glass Works Process for manufacturing cathode ray tube bulbs
US4213663A (en) * 1978-12-26 1980-07-22 Rca Corporation Wet carbon-dioxide treatment of partially-completed CRT
US4217015A (en) * 1977-12-09 1980-08-12 Sony Corporation Cathode ray tube and a ventilator used in its baking process
US4350514A (en) * 1980-05-19 1982-09-21 Hitachi, Ltd. Method for manufacturing cathode ray tubes

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5396663A (en) * 1977-02-04 1978-08-24 Hitachi Ltd Manufacture of cathode-ray tube
JPS53123654A (en) * 1977-04-04 1978-10-28 Hitachi Ltd Production of color picture tube
JPS56134446A (en) * 1980-03-26 1981-10-21 Hitachi Ltd Manufacturing device and method of color picture tube
JPS56149745A (en) * 1980-04-22 1981-11-19 Toshiba Corp Manufacturing method for cathode-ray tube
JPS6113343A (ja) * 1984-06-28 1986-01-21 Fujitsu Ltd コンソ−ル装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041127A (en) * 1959-12-22 1962-06-26 Rca Corp Method of fabricating a cathode ray tube
US3658401A (en) * 1970-01-06 1972-04-25 Rca Corp Method of manufacture of cathode ray tubes having frit-sealed envelope assemblies
US3932011A (en) * 1974-06-05 1976-01-13 Rca Corporation Conditioning partially-completed CRT bulb assembly for storage and/or transit
US4058387A (en) * 1975-07-03 1977-11-15 Owens-Illinois, Inc. Simultaneously baking and sealing a faceplate assembly
US4154494A (en) * 1977-05-23 1979-05-15 Corning Glass Works Process for manufacturing cathode ray tube bulbs
US4217015A (en) * 1977-12-09 1980-08-12 Sony Corporation Cathode ray tube and a ventilator used in its baking process
US4213663A (en) * 1978-12-26 1980-07-22 Rca Corporation Wet carbon-dioxide treatment of partially-completed CRT
US4350514A (en) * 1980-05-19 1982-09-21 Hitachi, Ltd. Method for manufacturing cathode ray tubes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5145511A (en) * 1991-11-08 1992-09-08 Videocolor Spa Method for manufacturing a metallized luminescent screen for a cathode-ray tube
US5405722A (en) * 1993-12-22 1995-04-11 Rca Thomson Licensing Corp. Method for combined baking-out and sealing of an electrophotographically processed screen assembly for a cathode-ray tube
EP1126498A3 (de) * 2000-01-28 2006-08-23 ELINO INDUSTRIE-OFENBAU CARL HANF GmbH & CO. Verfahren und Vorrichtung zur Wärmebehandlung von Bildröhren

Also Published As

Publication number Publication date
KR920004638B1 (ko) 1992-06-12
JPH047529B2 (enrdf_load_stackoverflow) 1992-02-12
CA1229131A (en) 1987-11-10
GB2135504A (en) 1984-08-30
FR2539553B1 (fr) 1988-05-13
IT1174467B (it) 1987-07-01
KR840007298A (ko) 1984-12-06
IT8419160A0 (it) 1984-01-13
JPS59138035A (ja) 1984-08-08
GB2135504B (en) 1986-05-14
FR2539553A1 (fr) 1984-07-20
GB8400910D0 (en) 1984-02-15
HK41391A (en) 1991-06-07

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